Enhanced thermopower in an intergrowth cobalt oxide Li$_{0.48}$Na$_{0.35}$CoO$_{2}$

Zhi Ren; Jingqin Shen; Shuai Jiang; Xiaoyang Chen; Chunmu Feng; Zhu'an Xu; Guanghan Cao

doi:10.1088/0953-8984/18/29/L01

paper

Enhanced thermopower in an intergrowth cobalt oxide Li $_{0.48}$ Na $_{0.35}$ CoO $_{2}$

arXiv:cond-mat/0511691 · doi:10.1088/0953-8984/18/29/L01

Abstract

We report the measurements of thermopower, electrical resistivity and thermal conductivity in a complex cobalt oxide Li $_{0.48}$ Na $_{0.35}$ CoO $_{2}$ , whose crystal structure can be viewed as an intergrowth of the O3 phase of Li $_{x}$ CoO $_{2}$ and the P2 phase of Na $_{y}$ CoO $_{2}$ along the c axis. The compound shows large room-temperature thermopower of $\sim$ 180 $I^¼$ V/K, which is substantially higher than those of Li $_{x}$ CoO $_{2}$ and Na $_{y}$ CoO $_{2}$ . The figure of merit for the polycrystalline sample increases rapidly with increasing temperature, and it achieves nearly 10 $^{- 4}$ K $^{- 1}$ at 300 K, suggesting that Li $_{x}$ Na $_{y}$ CoO $_{2}$ system is a promising candidate for thermoelectric applications.

Submitted to APL

Enhanced thermopower in an intergrowth cobalt oxide Li0.48​Na0.35​CoO2​

Abstract

Enhanced thermopower in an intergrowth cobalt oxide Li $_{0.48}$ Na $_{0.35}$ CoO $_{2}$